The A308 (M) about to finish its route at the Braywick Roundabout
The A308 (M) connects the M4 and A404 (M) with the A308 road leading to central Maidenhead. It has no junctions, starting at Holyport Interchange and ending in Balwick Roundabout. Its purpose was to keep local traffic away from motorway traffic wanting to join the M4 in Maidenhead.